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Kate, The Duchess of Cambridge, is "continuing to feel better" as she spends a second day at London's King Edward VII Hospital, according to St. James's Palace. Prince William paid a visit to the bedside of his wife and mother-to-be of a future British monarch, Tuesday.

"The Duchess of Cambridge is continuing to feel better," a St. James's Palace spokesman said. "She and the Duke are immensely grateful for the good wishes they have received. She will remain in hospital at present and will continue to be treated for Hyperemesis Gravidarum."

Duchess of Cambridge's Royal Style: St. Patrick's Day

The rare medical condition affects 2 percent of all pregnant mothers and causes severe nausea and vomiting. Hospitalization is often required because of concern over dehydration and to ensure the mother receives proper nutrition.

The fetus is rarely affected by the condition, as long as the mother gets proper treatment and rest, according to NBC’s chief medical editor, Dr. Nancy Snyderman.

Ben Fogle, a friend of the royal couple, told "Today" that the impending birth has refocused attention on Britain: "The world is already descending on London, and everyone has a huge smile on their face."